CN105871019A - Passive balance control method - Google Patents
Passive balance control method Download PDFInfo
- Publication number
- CN105871019A CN105871019A CN201610312760.5A CN201610312760A CN105871019A CN 105871019 A CN105871019 A CN 105871019A CN 201610312760 A CN201610312760 A CN 201610312760A CN 105871019 A CN105871019 A CN 105871019A
- Authority
- CN
- China
- Prior art keywords
- cell
- battery
- voltage
- joint
- passive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 210000001503 Joints Anatomy 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 239000000178 monomer Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 229910052744 lithium Inorganic materials 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N lithium Chemical compound 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[Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000005955 Ferric phosphate Substances 0.000 description 2
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K Iron(III) phosphate Chemical compound 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[Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 229940032958 ferric phosphate Drugs 0.000 description 2
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910004682 ON-OFF Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002085 persistent Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
Abstract
The invention discloses a passive balance control method. The method comprises the steps that 1, a passive balance control circuit is preset, each of a plurality of series battery cells is connected with a power resistor and a balance switch in parallel; 2, the battery cells are charged, during i<th> time of charging, a microcontrol unit detects the voltages of the battery cells, and under the condition that the voltage of the m<th> battery cell exceeds the threshold voltage, the cell number of the m<th> battery cell is recorded, and the battery cell is subjected to voltage balancing; 3, during (i+1)<th> time of charging, the m<th> battery cell in the i<th> time of charging is directly subjected to voltage balancing, and when the voltage of the m<th> battery cell exceeds the threshold voltage, the cell number of the m<th> battery cell in (i+1)<th> time of charging is covered and recorded, and the battery cell is subjected to voltage balancing; 4, the step 2 and the step 3 are repeatedly executed in sequence for voltage balancing. According to the method, the effects of prolonging the balancing time and improving the balancing efficiency are achieved.
Description
Technical field
The present invention relates to the field of the passive Balance route of power supply, in particular it relates to passive balance control method.
Background technology
The application in new-energy automobile, Large Copacity energy-storage system of the high-capacity lithium battery group is more and more extensive.
Owing to the difference of environment is being manufactured and used to lithium battery monomer, along with the growth of the time of use, lithium
Discordance between battery cell can increase, and affects the performance of battery available capacity, it is therefore desirable to equilibrium
It is equalized by circuit, improves the difference between lithium battery capacity.
Set of cells is carried out by the current general passive balanced way using bypass resistance power consumption to add on-off control
Equilibrium, but there are some difficult problems in the design of this balanced way: battery when electric discharge, battery terminal voltage
Acutely, therefore equilibrium will not be opened in change；When battery charging is on voltage platform, due between battery
Pressure reduction is too small and the voltage detection error problem of BMS, therefore typically also will not open；Fill at battery
The when of electric latter stage, the voltage differences between battery can significantly increase, and therefore passive equilibrium is typically last in charging
Phase opens, and discharges several batteries that voltage is higher, but the persistent period in latter stage of charging is shorter.
Simultaneously because the electric energy of battery is converted into heat energy by bypass resistance by this passive balanced way, the most right
The requirement of resistive dissipation is higher, and this results in euqalizing current and can not design excessive；Summary reason, just
The efficiency that result in passive equilibrium is the lowest.
Summary of the invention
It is an object of the invention to provide a kind of passive balance control method, this passive balance control method overcomes
The low-down problem of efficiency of passive equilibrium of the prior art, it is achieved that extend time for balance, improves
Equalization efficiency, improves the effect of equilibrium.
To achieve these goals, the invention provides a kind of passive balance control method, this passively equalizes
Control method includes:
Step 1, presets passive balancing control circuit, by the described list of often joint of the cell of multiple series connection
A power resistor and an equalizer switch all it is parallel with on body battery；
Step 2, is charged cell, and when i & lt is charged, micro-control unit detection is multiple
The voltage of described cell, in the case of the voltage of m joint cell exceedes threshold voltage, record
M saves the battery number of cell and described cell is carried out electric voltage equalization；
Step 3, when i+1 time charging, the m in directly charging i & lt saves described cell
Carry out electric voltage equalization；Micro-control unit detects the voltage of multiple described cells, saves cell at m
Voltage exceed threshold voltage in the case of, micro-control unit close i & lt charging in m save described list
The electric voltage equalization of body battery, and cover the m described single-cell battery number of joint in record i+1 time charging
And described cell is carried out electric voltage equalization；
Step 4, is repeated in performing step 2 and step 3 carries out electric voltage equalization.
Preferably, described micro-control unit uses the form of PMW ripple to carry out electric voltage equalization.
Preferably, described threshold voltage is 3.5V-4.0V.
Preferably, m is saved described single-cell battery number record at Flash ROM by described micro-control unit
In.
Preferably, in step 3, m is saved described single-cell battery number note by described micro-control unit
Record in Flash ROM, the battery number of the independent battery of simultaneously erased last registration.
Preferably, the quantity of described cell is 12 joints, and the quantity of described m joint cell is 4-6
Joint；Or
The quantity of described cell is 24 joints, and the quantity of described m joint cell is 8-12 joint.
By the way of above-mentioned, the present invention can extend the time for balance of passive equilibrium so that small area analysis
Passive balanced way also can play significant effect, promotes equalization efficiency.Present invention, avoiding at voltage
On platform, owing between battery, mistake is opened in the too small equilibrium caused with BMS voltage detection error of pressure reduction
Problem.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, with
Detailed description below is used for explaining the present invention together, but is not intended that limitation of the present invention.?
In accompanying drawing:
Fig. 1 is the circuit diagram of a kind of passive balancing control circuit that the present invention is described；
Fig. 2 is the flow chart of a kind of passive balance control method that the present invention is described.
Detailed description of the invention
Below in conjunction with accompanying drawing, the detailed description of the invention of the present invention is described in detail.It should be appreciated that
Detailed description of the invention described herein is merely to illustrate and explains the present invention, is not limited to this
Bright.
The present invention provides a kind of passive balance control method, and this passive balance control method includes:
Step 1, presets passive balancing control circuit, by the described list of often joint of the cell of multiple series connection
A power resistor and an equalizer switch all it is parallel with on body battery；
Step 2, is charged cell by passive balancing control circuit, when i & lt is charged,
Micro-control unit detects the voltage of multiple described cells, and the voltage at m joint cell exceedes threshold value
In the case of voltage, the record m joint battery number of cell that described cell is carried out voltage is equal
Weighing apparatus；
Step 3, when i+1 time charging, the m in directly charging i & lt saves described cell
Carry out electric voltage equalization；Micro-control unit detects the voltage of multiple described cells, saves cell at m
Voltage exceed threshold voltage in the case of, micro-control unit close i & lt charging in m save described list
The electric voltage equalization of body battery, and cover the m described single-cell battery number of joint in record i+1 time charging
And described cell is carried out electric voltage equalization；
Step 4, is repeated in performing step 2 and step 3 carries out electric voltage equalization.
The present invention can extend the time for balance of passive equilibrium so that the passive balanced way of small area analysis also can
Play significant effect, promote equalization efficiency.Present invention, avoiding on voltage platform, due to battery
Between pressure reduction is too small and BMS voltage detection error causes the equilibrium problem of opening mistake.By above-mentioned
Mode, it is possible to achieve the electric voltage equalization of selectivity cell, promotes the efficiency of equilibrium, and default is passive
Balancing control circuit can realize the selectivity equilibrium of series-connection power supplies, and arranging of micro-control unit can realize
Monomer battery voltage is measured and the selection of cell.
In a kind of detailed description of the invention of the present invention, described micro-control unit uses the form of PMW ripple
Carry out electric voltage equalization.Euqalizing current is carried out by the form of PMW ripple.
In a kind of detailed description of the invention of the present invention, described threshold voltage is 3.3V-3.5V, wherein,
It is typically set to about 3.5V for ferric phosphate lithium cell.
In a kind of detailed description of the invention of the present invention, m is saved described monomer electricity by described micro-control unit
Pond battery number records in Flash ROM.Thus realize the record of the battery number of cell, it is also convenient for
Selectivity equilibrium in next time cell charging process.
In a kind of detailed description of the invention of the present invention, in step 3, m is saved by described micro-control unit
Described single-cell battery number records in Flash ROM, the independent battery of simultaneously erased last registration
Battery number.
By the way of above-mentioned, it is possible to achieve the cell of the need equilibrium in the charging process of adjacent twice
Judgement, cell is carried out select replace.
In a kind of detailed description of the invention of the present invention, in order to reduce consumption, and do not affect battery realization
Its function, the quantity of described cell is 12 joints, and the quantity of described m joint cell is 4-6 joint；
Or the quantity of described cell is 24 joints, the quantity of described m joint cell is 8-12 joint.
In a kind of most preferably embodiment of the present invention, if set of cells is by n joint cell series connection
Become, often joint cell B1～Bn parallel power resistance R1～Rn and equalizer switch K1～Kn respectively,
Form passive equalizing circuit.The passive Balance route strategy that then present invention proposes is specific as follows:
1) when i & lt is charged, MCU detects cell voltage, when set of cells charging arrives latter stage,
Assume the most just m batteries terminal voltage to have exceeded threshold voltage Vi (general for ferric phosphate lithium cell
It is set to about 3.5V), it is equalized by MCU, is recorded by the battery number of these several batteries simultaneously
In Flash ROM.
2) when i+1 time charging, when cell voltage arrives battery stages, directly to Flash ROM
The m batteries of the inside record passively equalizes, and euqalizing current uses PWM waveform formula；
3) when i+1 charging arrives latter stage, MCU is by firm for the monomer voltage of the m batteries detected
The battery having been switched on equilibrium is closed well, by the battery of these several batteries more than threshold voltage Vi, MCU
Number record is in Flash ROM, and opens the equalizing circuit of these several batteries, and simultaneously erased i & lt is filled
The battery number of record during electricity；
4) when charging for the i-th+2 times, then on voltage platform, the m batteries of i+1 time record is opened
Open passive equilibrium, be circulated with this.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, but, the present invention does not limit
Detail in above-mentioned embodiment, in the technology concept of the present invention, can be to the present invention
Technical scheme carry out multiple simple variant, these simple variant belong to protection scope of the present invention.
It is further to note that each the concrete technology described in above-mentioned detailed description of the invention is special
Levy, in the case of reconcilable, can be combined by any suitable means, in order to avoid need not
The repetition wanted, various possible compound modes are illustrated by the present invention the most separately.
Additionally, combination in any can also be carried out between the various different embodiment of the present invention, as long as its
Without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (6)
1. a passive balance control method, it is characterised in that this passive balance control method includes:
Step 1, presets passive balancing control circuit, by the described list of often joint of the cell of multiple series connection
A power resistor and an equalizer switch all it is parallel with on body battery；
Step 2, is charged cell, and when i & lt is charged, micro-control unit detection is multiple
The voltage of described cell, in the case of the voltage of m joint cell exceedes threshold voltage, record
M saves the battery number of cell and described cell is carried out electric voltage equalization；
Step 3, when i+1 time charging, the m in directly charging i & lt saves described cell
Carry out electric voltage equalization；Micro-control unit detects the voltage of multiple described cells, saves cell at m
Voltage exceed threshold voltage in the case of, micro-control unit close i & lt charging in m save described list
The electric voltage equalization of body battery, and cover the m described single-cell battery number of joint in record i+1 time charging
And described cell is carried out electric voltage equalization；
Step 4, is repeated in performing step 2 and step 3 carries out electric voltage equalization.
Passive balance control method the most according to claim 1, it is characterised in that described micro-control
Unit processed uses the form of PMW ripple to carry out electric voltage equalization.
Passive balance control method the most according to claim 1, it is characterised in that described threshold value
Voltage is 3.5V-4.0V.
Passive balance control method the most according to claim 1, it is characterised in that described micro-control
M is saved described single-cell battery number and records in Flash ROM by unit processed.
Passive balance control method the most according to claim 1, it is characterised in that in step 3
In, m is saved described single-cell battery number and records in Flash ROM by described micro-control unit, with
Time erasing last registration the battery number of independent battery.
Passive balance control method the most according to claim 1, it is characterised in that described monomer
The quantity of battery is 12 joints, and the quantity of described m joint cell is 4-6 joint；Or
The quantity of described cell is 24 joints, and the quantity of described m joint cell is 8-12 joint.
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| CN201610312760.5A CN105871019A (en) | 2016-05-11 | 2016-05-11 | Passive balance control method |
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| CN201610312760.5A CN105871019A (en) | 2016-05-11 | 2016-05-11 | Passive balance control method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106340920A (en) * | 2016-09-19 | 2017-01-18 | 东软集团股份有限公司 | Control method and device of passive equalization of battery pack, battery system and vehicle |
| CN106711521A (en) * | 2016-11-16 | 2017-05-24 | 安徽锐能科技有限公司 | Balancing control method and circuit for battery pack |
| CN109860741A (en) * | 2019-02-27 | 2019-06-07 | 广州宝狮新能源有限公司 | A kind of compatible fault-tolerant large-sized battery series connection and PCS parallel system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101872991A (en) * | 2010-06-28 | 2010-10-27 | 惠州市亿能电子有限公司 | Balance control method of power battery pack |
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2016
- 2016-05-11 CN CN201610312760.5A patent/CN105871019A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872991A (en) * | 2010-06-28 | 2010-10-27 | 惠州市亿能电子有限公司 | Balance control method of power battery pack |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106340920A (en) * | 2016-09-19 | 2017-01-18 | 东软集团股份有限公司 | Control method and device of passive equalization of battery pack, battery system and vehicle |
| CN106340920B (en) * | 2016-09-19 | 2019-01-25 | 东软集团股份有限公司 | Control method, device, battery system and the vehicle of the passive equilibrium of battery pack |
| CN106711521A (en) * | 2016-11-16 | 2017-05-24 | 安徽锐能科技有限公司 | Balancing control method and circuit for battery pack |
| CN106711521B (en) * | 2016-11-16 | 2019-05-07 | 安徽锐能科技有限公司 | Battery pack balancing control method and control circuit |
| CN109860741A (en) * | 2019-02-27 | 2019-06-07 | 广州宝狮新能源有限公司 | A kind of compatible fault-tolerant large-sized battery series connection and PCS parallel system |
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Application publication date: 20160817 |